
  <button mat-icon-button (click)="toggleSide()">
    <mat-icon>menu</mat-icon>
  </button>
  <span>{{title}}</span>


  <span class="tool-bar-spacer"></span>
  <button mat-icon-button>
    <mat-icon>notification_important</mat-icon>
  </button>
  <button mat-icon-button [matMenuTriggerFor]="menu">
    <mat-icon>more_vert</mat-icon>
  </button>
  <mat-menu #menu="matMenu">
    <button mat-menu-item>
      <mat-icon>settings</mat-icon>
      <span>系统设置</span>
    </button>
    <button mat-menu-item>
      <mat-icon>perm_identity</mat-icon>
      <span>个人设置</span>
    </button>
    <button mat-menu-item>
      <mat-icon>exit_to_app</mat-icon>
      <span>退出</span>
    </button>
  </mat-menu>
